<div><svg width="726" height="134">
         
         <polygon points="9 17 1 13 1 21"></polygon>
         <polygon points="17 17 9 13 9 21"></polygon>
         <rect x="31" y="3" width="62" height="32" rx="10"></rect>
         <rect x="29" y="1" width="62" height="32" class="terminal" rx="10"></rect>
         <text class="terminal" x="39" y="21">ALTER</text>
         <rect x="113" y="3" width="62" height="32" rx="10"></rect>
         <rect x="111" y="1" width="62" height="32" class="terminal" rx="10"></rect>
         <text class="terminal" x="121" y="21">TABLE</text>
         <rect x="215" y="35" width="34" height="32" rx="10"></rect>
         <rect x="213" y="33" width="34" height="32" class="terminal" rx="10"></rect>
         <text class="terminal" x="223" y="53">IF</text>
         <rect x="269" y="35" width="68" height="32" rx="10"></rect>
         <rect x="267" y="33" width="68" height="32" class="terminal" rx="10"></rect>
         <text class="terminal" x="277" y="53">EXISTS</text>
         
            <rect x="377" y="3" width="94" height="32"></rect>
            <rect x="375" y="1" width="94" height="32" class="nonterminal"></rect>
            <text class="nonterminal" x="385" y="21">table_name</text>
         
         <rect x="491" y="3" width="86" height="32" rx="10"></rect>
         <rect x="489" y="1" width="86" height="32" class="terminal" rx="10"></rect>
         <text class="terminal" x="499" y="21">VALIDATE</text>
         <rect x="597" y="3" width="108" height="32" rx="10"></rect>
         <rect x="595" y="1" width="108" height="32" class="terminal" rx="10"></rect>
         <text class="terminal" x="605" y="21">CONSTRAINT</text>
         
            <rect x="573" y="101" width="126" height="32"></rect>
            <rect x="571" y="99" width="126" height="32" class="nonterminal"></rect>
            <text class="nonterminal" x="581" y="119">constraint_name</text>
         
         <path class="line" d="m17 17 h2 m0 0 h10 m62 0 h10 m0 0 h10 m62 0 h10 m20 0 h10 m0 0 h132 m-162 0 h20 m142 0 h20 m-182 0 q10 0 10 10 m162 0 q0 -10 10 -10 m-172 10 v12 m162 0 v-12 m-162 12 q0 10 10 10 m142 0 q10 0 10 -10 m-152 10 h10 m34 0 h10 m0 0 h10 m68 0 h10 m20 -32 h10 m94 0 h10 m0 0 h10 m86 0 h10 m0 0 h10 m108 0 h10 m2 0 l2 0 m2 0 l2 0 m2 0 l2 0 m-176 98 l2 0 m2 0 l2 0 m2 0 l2 0 m2 0 h10 m126 0 h10 m3 0 h-3"></path>
         <polygon points="717 115 725 111 725 119"></polygon>
         <polygon points="717 115 709 111 709 119"></polygon>
      </svg></div>